This trainer has been made for Naval Warfare, Retail unpatched version.

Trainer download link:
Naval Warfare +2 trainer

First run the trainer.
Then run the game. (You can start the game with it's own icon or You can use the Start game button in the trainer.)
Hit number keys on the numerical keyboard to turn options on/off. Make sure that NumLock is active.
You can also use the checkboxes to enable/disable the options.

There are 2 options in this trainer:

1. Unlimited Health
2. Unlimited Ammo and Superweapons

NOTES:

Unlimited Health: You will never die.

Unlimited Ammo and Superweapons: Unlimited mines, torpedoes and superweapons.

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Some information about virus reports for trainers generally. Read it before You post something about some virus.
http://szemelyesintegracio.hu/cheats/41-game-hacking-articles/212-trainers-and-anti-vir-softwares